package com.atguigu.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnum;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartyFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegistVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Controller
public class LoginController {

    @Autowired
    private ThirdPartyFeignService thirdPartyFeignService;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private MemberFeignService memberFeignService;

    /**
     * 获取短信验证码
     * @param phone
     * @return
     */
    @GetMapping("/sms/sendcode")
    @ResponseBody
    public R sendCode(@RequestParam("phone") String phone) {
        // TODO 1、接口防刷
        String redisCode = this.redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)) {
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l < 60000) {
                // 60秒内不能再发
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION.getCode(), BizCodeEnum.SMS_CODE_EXCEPTION.getMessage());
            }
        }
        // 2、验证码的再次校验
        String code = UUID.randomUUID().toString().substring(0, 4);
        String substring = code + "_" + System.currentTimeMillis();
        // redis缓存验证码，防止同一个phone手机号在60秒内再次发送验证码
        this.redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, substring, 10, TimeUnit.MINUTES);

        this.thirdPartyFeignService.sendCode(phone, code);
        return R.ok();
    }

    /**
     * TODO 重定向携带数据，利用session原理。将数据放在session中
     * TODO 只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
     * TODO 一定要解决分布式下的session问题
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result, RedirectAttributes redirectAttributes) {

        if (result.hasErrors()) {
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
            redirectAttributes.addFlashAttribute("errors", errors);
//            model.addAttribute("errors", errors);
            // 校验出错，重定向到注册页面
            return "redirect:http://auth.gulimall.com/reg.html";
        }
        // 1、校验验证码
        String code = vo.getCode();
        String s = this.redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if (!StringUtils.isEmpty(s)) {
            if (code.equals(s.split("_")[0])) {
                // 删除验证码，原理就是令牌机制
                this.redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                // 验证码通过，真正注册，调用远程服务进行注册
                R r = this.memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    // 注册成功回到首页，回到登录页
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    Map<String, String> errors = new HashMap<>();

                    errors.put("msg", r.getData("msg", new TypeReference<String>() {}));
                    redirectAttributes.addFlashAttribute("errors", errors);

                    return "redirect:http://auth.gulimall.com/reg.html";
                }
            } else {
                Map<String, String> errors = new HashMap<>();

                errors.put("code", "验证码错误");
                redirectAttributes.addFlashAttribute("errors", errors);

                return "redirect:http://auth.gulimall.com/reg.html";
            }
        } else {
            Map<String, String> errors = new HashMap<>();

            errors.put("code", "验证码错误");
            redirectAttributes.addFlashAttribute("errors", errors);

            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session) {
        // 远程登录
        R login = this.memberFeignService.login(vo);
        if (login.getCode() == 0) {
            // 调用成功
            MemberRespVo data = login.getData("data", new TypeReference<MemberRespVo>() {});
            // 登录成功，放到session中
            session.setAttribute(AuthServerConstant.LOGIN_USER, data);
            return "redirect:http://gulimall.com";
        } else {
            Map<String, String> errors = new HashMap<>();

            errors.put("msg", login.getData("msg", new TypeReference<String>() {}));
            redirectAttributes.addFlashAttribute("errors", errors);

            return "redirect:http://auth.gulimall.com/login.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session) {
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            // 没登录
            return "login";
        } else {
            return "redirect:http://gulimall.com";
        }
    }
}
